All 7 Uses

colleague
in
The Girl on the Train
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Writing an important email to a colleague at the office in New York, or a carefully worded break-up message to his girlfriend.†
p. 13.3
My mother, our friends, colleagues at work.†
p. 97.9

colleagues = fellow workers -- especially in a respected profession such as teaching, medicine, or law
The only other quote comes from a man called David Clark, "a former colleague" of Scott's, who says, "Megs and Scott are a great couple.†
p. 109.7
Another fight, towards the end: waking, postparty, post-blackout, Tom telling me how I'd been the night before, embarrassing him again, insulting the wife of a colleague of his, shouting at her for flirting with my husband.†
p. 129.7
All I know is that Tom hates me now, he won't talk to me any longer, and he has told everyone I know about the terrible thing I've done, and everyone has turned against me: old colleagues, my friends, even my mother.†
p. 223.4

colleagues = fellow workers -- especially in a respected profession such as teaching, medicine, or law
Like that time we went to a party thrown by a colleague of Tom's, and I was very drunk, but we'd had a good night.†
p. 332.8 *
Clara was the colleague's wife, a lovely woman, warm and kind.†
p. 332.9

Definitions:

(1) (colleague)
fellow worker -- especially in a respected profession such as teaching, medicine, or law
(2) (meaning too rare to warrant focus)